Health
Body Fat % (US Navy)
Estimate body fat percentage using the US Navy circumference method and break it down into lean versus fat mass.
US Navy method using circumference measurements for a solid quick estimate.
US Navy body fat equations
For males: %BF = 495 / [1.0324 − 0.19077 log₁₀(waist − neck) + 0.15456 log₁₀(height)] − 450. For females, replace the numerator with waist + hip − neck and swap constants per the Navy formula.
How to use
- Select gender to toggle the correct circumference fields.
- Enter height plus waist, neck, and (for females) hip measurements in centimeters.
- Provide body weight to translate the percentage into lean and fat mass estimates.
Example
Input: Male, Height = 175 cm, Waist = 85 cm, Neck = 38 cm, Weight = 75 kg
Output: Body fat ≈ 16.9%, Lean mass ≈ 62.4 kg, Fat mass ≈ 12.6 kg
Student-friendly breakdown
This walkthrough emphasizes the most searched ideas for Body Fat % (US Navy): body fat calculator, body fat percentage calculator, body fat calculator navy, body fat bmi calculator. Start with the formula above, then follow the guided steps to double-check your work. For quick revision, highlight the givens, plug into the equation, and finish by verifying your units.
Need more support? Use the links below to open the long-form guide, browse additional examples, or hop into adjacent calculators within the same topic — each one is a quick way to double-check your work or handle a related question without starting from scratch.
Deep dive & study plan
Body Fat % (US Navy): US Navy body-fat estimate with circumference measurements. It's built around body fat, composition, so you can go from a raw question to a checked answer without switching tools.
The math behind it: For males: %BF = 495 / [1.0324 − 0.19077 log₁₀(waist − neck) + 0.15456 log₁₀(height)] − 450. For females, replace the numerator with waist + hip − neck and swap constants per the Navy formula.
To use it well: (1) Select gender to toggle the correct circumference fields. (2) Enter height plus waist, neck, and (for females) hip measurements in centimeters. (3) Provide body weight to translate the percentage into lean and fat mass estimates. Keep your units consistent as you go, and re-run a case you already know the answer to — it's the fastest way to catch a typo before it throws off a result you're relying on.
Worked example: entering Male, Height = 175 cm, Waist = 85 cm, Neck = 38 cm, Weight = 75 kg returns Body fat ≈ 16.9%, Lean mass ≈ 62.4 kg, Fat mass ≈ 12.6 kg. Try swapping in your own numbers next, especially a case you're unsure about, before you use this for something that matters.
Quick retention checklist
- Speak the formula aloud (or annotate it) so the relationships stick.
- Write each step in your own words and compare with the numbered list above.
- Swap in new numbers for the Example to make sure the calculator (and your logic) handles edge cases.
- Check at least one related calculator below — it's the fastest way to confirm your numbers still line up from a different angle.
FAQ & notes
How accurate is the US Navy method?
It provides a solid estimate when measurements are precise, but DEXA scans and calipers deliver more accurate body composition data.
Can I enter measurements in inches?
At the moment the calculator expects centimeters. Convert inches to centimeters (multiply by 2.54) before entering your numbers.
What formula does the Body Fat % (US Navy) use?
For males: %BF = 495 / [1.0324 − 0.19077 log₁₀(waist − neck) + 0.15456 log₁₀(height)] − 450. For females, replace the numerator with waist + hip − neck and swap constants per the Navy formula.
How do I use the Body Fat % (US Navy)?
Select gender to toggle the correct circumference fields. Enter height plus waist, neck, and (for females) hip measurements in centimeters. Provide body weight to translate the percentage into lean and fat mass estimates.